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Here's 2 links to converters, one from LASTools and one from ArcGIS:

https://github.com/LASliberator/LASliberator

https://www.arcgis.com/home/item.html?i ... 9a860a374f

Forgot to add that the header of most LAS and LAZ files contains not only Coordinate System information, but also metadata about returns, histogram of classifications, scale, etc.

Hi @Klawd65,
I use LASInfo in LASTools to read the header of a LAS or LAZ file.
Dave

LAStools will assign a coordinate system to a LAS file.
https://rapidlasso.com/lastools/